Guitarists seeking enhanced tuning stability and effortless string changes have eagerly embraced the D’Addario Auto-Trim Locking Tuners. These tuners promise innovative features that promise to streamline the playing experience (see: auto-trim). In this review, I delve into their installation process, tuning stability, control, weight, and appearance to assess whether they truly fulfill their promises and stand out in the world of guitar accessories.

At a Glance

D’Addario Auto-Trim Locking Tuners

D’Addario Auto-Trim Locking Tuners

  • Intended Instrument: Guitar
  • Configuration: 3+3
  • Finish: Black
  • Locking: Yes
  • Gear Ratio: 18:1
  • Peg Diameter: 0.375″ (peg), 0.390″ (10mm peg hole)

Brian's Take: These tuners are well-reviewed online, tune accurately, and hold that tuning. However, you may have to pull out the drill to install them, and their look may not be for everyone. These tuners tend to be more polarizing - they're great for some, and not for others, and I think that's ok. If you like their look and their functionality, go for it! D'addario is a trusted brand.

  • Streamlined string changes
  • Enhanced stability
  • Precise control
  • Installation issues
  • Appearance reviews mixed
  • TBD

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The installation process for the D’Addario Auto-Trim Locking Tuners has been hailed as straightforward by many, and that was my experience as well. It was pretty simple and straightforward! It’s worth mentioning that some users found it necessary to ream or drill holes to accommodate the tuner posts, particularly when transitioning from different tuner sizes, but I didn’t run into this scenario.

Additionally, the auto-trim feature, which cuts excess string length, has garnered praise for making string changes hassle-free. I had fun testing this feature, but in full transparency, I prefer the old school method of clipping strings manually.


Tuning stability is a paramount concern for any guitarist, and the D’Addario Auto-Trim Locking Tuners strive to excel in this aspect. Users have reported improved tuning consistency, with the locking mechanism effectively preventing strings from slipping or becoming unwound. This feature is particularly appreciated by those who perform live or frequently change tunings.


With a gear ratio of 18:1, the D’Addario Auto-Trim Locking Tuners offer precise tuning adjustments, contributing to their reputation for enhanced tuning stability. This higher gear ratio allows for finer control over the tuning process, making them particularly appealing for musicians who require accurate tuning for recording or intricate performances. The innovative auto-trim locking mechanism is a focal point, streamlining the string-changing process and potentially reducing the need for extra tools. While the gear ratio certainly plays a role in control, the tuners’ overall design aims to provide musicians with smoother tuning experiences and more accurate adjustments.


Weight isn’t something I found an issue with, and it’s not a prominent aspect discussed in online reviews. Typically, tuners are designed to be lightweight to minimize any additional strain on the headstock. It’s advisable to research product specifications or seek advice from experts if weight is a significant concern for you.


The appearance of the D’Addario Auto-Trim Locking Tuners seems to be a point of satisfaction for many users. With various finish options available, including satin black, these tuners can provide a sleek and modern aesthetic to your instrument. The integration of the auto-trim mechanism doesn’t appear to compromise the overall visual appeal of the tuners.

With all that said, I’m not personally a fan of how these look, no matter the finish. I don’t like tuners to stand out too much, and I find the included design element to be distracting.

Are the D’Addario Auto-Trim Locking Tuners Right for You?

Determining whether the D’Addario Auto-Trim Locking Tuners are the ideal choice for you depends on your playing style, preferences, and guitar setup. These tuners come with unique features designed to enhance tuning stability and streamline string changes. To help you decide if they’re the right fit, let’s explore who these tuners are suitable for and what type of guitars they pair well with:

  1. Performing Musicians: If you frequently perform live and need rapid string changes without compromising tuning stability, these tuners could be a valuable asset. The auto-trim locking mechanism simplifies string changes, which can be a game-changer during fast-paced gigs.
  2. Studio Musicians and Recording Artists: The precise tuning adjustments offered by the 18:1 gear ratio make these tuners suitable for musicians who demand accurate tuning for recording sessions. The enhanced control allows for meticulous tuning adjustments required in studio environments.
  3. Players Seeking Modern Aesthetics: If you appreciate a sleek and contemporary appearance, the various finish options of the D’Addario Auto-Trim Locking Tuners, including satin black, can complement modern guitar designs.

What Kind of Guitars Do They Go Well With?

  1. Solid Body Electric Guitars: These tuners are well-suited for solid body electric guitars, especially those with a modern design. Their locking mechanism and precise tuning control can enhance the tuning stability of these instruments.
  2. Guitars with Innovative Features: If you own a guitar with advanced features, such as complex tremolo systems, the tuning stability provided by these tuners can help maintain your instrument’s intended performance.

What Kind of Guitars Would These Tuners Fit the Appearance Of?

  1. Modern and Sleek Guitars: The contemporary design of the D’Addario Auto-Trim Locking Tuners, along with their various finish options, pairs well with modern guitar designs that prioritize a sleek and minimalistic appearance.
  2. Guitars with Black Hardware: If your guitar features black hardware or accents, the satin black finish of these tuners could complement the overall aesthetics of your instrument.

Final Thoughts

The D’Addario Auto-Trim Locking Tuners showcase innovation in their auto-trim locking mechanism, aimed at simplifying string changes. They have received praise for their installation ease and enhanced tuning stability, which are crucial factors for guitarists. While the gear ratio and weight aren’t explicitly addressed in the provided reviews, these factors remain vital considerations when evaluating any set of tuners.

If you value the convenience of streamlined string changes and improved tuning stability, the D’Addario Auto-Trim Locking Tuners could be a valuable addition to your guitar setup. As with any gear, understanding your personal preferences and requirements will guide you toward making the best decision for your playing style and needs.

If you’re still undecided, or interested in looking at other options, check out my post on the best Les Paul tuners.